Given:
Two similar equilateral triangles with dimensions 2 cm and 5 cm.
The objective is to find the ratio of their side lengths.
The ratio of their length can be calculated as,
[tex]\begin{gathered} \text{Ratio of length=}\frac{Length\text{ of triangle 1}}{Length\text{ of traingle 2}} \\ =\frac{2}{5} \end{gathered}[/tex]Hence, option (B) is the correct answer.
